Those D.O.F. images are highly pixellated. P4 had a kind of depth effect that was based on the nearest and farthest thing from the camera. The image it produced was lousy, but it also produced a D.O.F. alpha channel (mask), so you could do a regular render, then apply filters through the D.O.F. alpha channel render in Photoshop to get good effects. So why not see if P5 produces a similar D.O.F. alpha channel? Then you can do it right in Photoshop.